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					Originally Posted by alatar  It's been studied in various species.  The female, in order to incorporate new genes into the tribe, will mate with the 'outsider.' There's also the cad-dad  theory, which states that females like a cad now and then to just a plain old dad.  And what could be plainer than a thousand-plus year old elf?
 
Luthien, obviously, knew that a hybrid would be more successful, and Beren was just so dashing, and if it didn't work out, he'd surely be dead in a hundred years or two. | 
	
 In Luthien's case, throw in a bit of rebellion, and I think you're right. Thingol wasn't the most liberal thinker in the Sil. He seemed to me a very strict father-figure, which made it easier for Luth to let her hair down. If it were the 60's, she'd be in Haight-Ashbury as a groupie for the Grateful Dead.